Não informado. (1908). The Mathematics Teacher. National Council of Teachers of Mathematics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. The Mathematics Teacher. Reston, Va: National Council of Teachers of Mathematics, 1908.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. The Mathematics Teacher. National Council of Teachers of Mathematics, 1908.
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